feat: Added Lists Pinnings endpoints (#31)

[myConsciousness]

1. Description

1.1. Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples.

1.2. Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

1.3. Related Issues

[myConsciousness]

pass

[github-actions]

Congratulations, this pull request has been reviewed and is ready for merging!

[myConsciousness]

bors merge

[codecov-commenter]

Codecov Report

Merging #97 (4223e18) into main (01f0d35) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   94.75%   94.92%   +0.16%     
==========================================
  Files          41       41              
  Lines        1164     1203      +39     
==========================================
+ Hits         1103     1142      +39     
  Misses         61       61              

Impacted Files	Coverage Δ
lib/src/service/lists/lists_service.dart	100.00% <100.00%> (ø)
test/src/service/lists/lists_service_test.dart	100.00% <100.00%> (ø)

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[bors]

Build succeeded:

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• test